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数学
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已知x+y=4,xy=3,求x²+y²和x的四次方+y的四次方
人气:424 ℃ 时间:2020-01-28 13:14:28
解答
x²+y²=(x+y)²-2xy=16-6=10;
x^4+y^4=(x²+y²)²-2x²y²=100-18=82.
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